Fix and remove READM.md

[cofinoa]

See issue [NA] for discussion of these changes.

Release checklist

• [ NA] Authors updated in cf-conventions.adoc? Add in two places: on line 3 and under .Additional Authors in About the authors.
• [NA] Next version in cf-conventions.adoc up to date? Versioning inspired by SemVer.
• [NA] history.adoc up to date?
• [NA] Conformance document up to date?

For maintainers

After the merge remember to delete the source branch.
Tags are set at the conclusion of the annual meeting; until then, main always is a draft for the next version.